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    <html lang="zh-CN">
    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>SprintBoot整合Dubbo - 交互式测验</title>
      <style>
        @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&display=swap');
        
        body {
          font-family: 'Noto Sans SC', sans-serif;
          background-color: #f4f7f9;
          color: #333;
          display: flex;
          justify-content: center;
          align-items: center;
          min-height: 100vh;
          margin: 0;
          padding: 20px;
          box-sizing: border-box;
        }
        
        .main-wrapper {
            position: relative;
            width: 100%;
            max-width: 900px; /* Wider to accommodate buttons */
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .quiz-container {
          background-color: #ffffff;
          border-radius: 16px;
          box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
          width: 100%;
          max-width: 700px;
          overflow: hidden;
          z-index: 10;
        }

        .quiz-header {
          background-color: #4a90e2;
          color: white;
          padding: 20px 30px;
          text-align: center;
        }

        .quiz-header h1 {
          margin: 0;
          font-size: 24px;
          font-weight: 700;
        }
        
        .quiz-header p {
            margin: 5px 0 0;
            font-size: 14px;
            opacity: 0.9;
        }

        .quiz-body {
          padding: 30px;
        }

        .progress-bar {
            display: none; /* 隐藏进度条 */
            width: 100%;
            background-color: #e0e0e0;
            border-radius: 5px;
            height: 10px;
            margin-bottom: 20px;
        }

        #progress-indicator {
            height: 100%;
            width: 0%;
            background-color: #4caf50;
            border-radius: 5px;
            transition: width 0.3s ease;
        }

        #question-container {
          margin-bottom: 20px;
        }

        #question-text {
          font-size: 18px;
          font-weight: 500;
          line-height: 1.6;
          margin-bottom: 25px;
        }

        .options-list {
          list-style: none;
          padding: 0;
          margin: 0;
        }

        .option-item {
          background-color: #f8f9fa;
          border: 1px solid #dee2e6;
          border-radius: 8px;
          padding: 15px;
          margin-bottom: 12px;
          cursor: pointer;
          transition: background-color 0.2s ease, border-color 0.2s ease;
        }

        .option-item:hover {
          background-color: #e9ecef;
        }
        
        .option-item.selected {
            background-color: #d1e7fd;
            border-color: #4a90e2;
        }

        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
        }

        .nav-btn {
          background-color: #4a90e2;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
          font-size: 16px;
          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        
        #next-btn {
            background-color: #28a745;
        }

        .nav-btn:hover {
          background-color: #357abd;
          transform: scale(1.05);
        }
        
        .nav-btn:disabled {
            background-color: #a0c3e8;
            cursor: not-allowed;
            opacity: 0.7;
        }

        #result-container {
            border-top: 1px solid #eee;
        }
        
        .result-box {
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .result-box.correct {
            background-color: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
        }

        .result-box.incorrect {
            background-color: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
        }
        
        .result-box h3 {
            margin-top: 0;
        }

        .explanation-text {
            margin-top: 15px;
            line-height: 1.7;
        }
        
        .source-text {
            font-style: italic;
            font-size: 14px;
            margin-top: 15px;
            color: #555;
        }

        
        .final-score-container {
            padding: 40px;
            text-align: center;
        }
        .final-score-container h2 {
            margin-top: 0;
            margin-bottom: 30px;
        }
        .score-summary {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .score-card {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 20px;
            width: 180px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
        }
        .score-card h3 {
            margin: 0 0 10px;
            font-size: 16px;
            font-weight: 500;
            color: #555;
        }
        .score-card p {
            margin: 0;
            font-size: 28px;
            font-weight: 700;
            color: #333;
        }
        .score-details table {
            width: 100%;
            font-size: 16px;
        }
        .score-details td {
            padding: 4px 0;
        }
        .score-details td:last-child {
            text-align: right;
            font-weight: 700;
        }
        .report-actions button {
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 8px;
            padding: 12px 25px;
            font-size: 16px;
            cursor: pointer;
            margin: 0 10px;
            transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
        }
        .report-actions button:hover {
            background-color: #f1f1f1;
            border-color: #bbb;
            transform: translateY(-2px);
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        .report-actions button.primary {
            background-color: #28a745;
            color: white;
            border-color: #28a745;
        }
        .report-actions button.primary:hover {
            background-color: #218838;
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        .hint-container {
            background-color: #e0f7fa;
            border: 1px solid #b2ebf2;
            border-radius: 8px;
            padding: 15px;
            margin-top: 20px;
            color: #006064;
            font-size: 15px;
            line-height: 1.6;
            display: none; /* 默认隐藏 */
        }
      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>SprintBoot整合Dubbo - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "在Dubbo服务提供者（Provider）的YML配置中，将 `dubbo.protocol.port` 的值设置为 `-1` 会产生什么效果？",
    "options": [
      "服务将使用Dubbo的默认端口20880进行通信。",
      "Dubbo框架会自动寻找一个当前系统未被占用的端口来暴露服务。",
      "该服务将无法被远程调用，只能在本地进行访问。",
      "这将禁用Dubbo协议，强制服务使用RESTful API进行通信。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "根据文档中提供者YML配置的注释，`port: -1` 的作用是让Dubbo框架自动扫描并分配一个可用的端口。这种方式非常灵活，可以有效避免在多服务部署时手动指定端口可能引发的端口冲突问题。",
    "source": "文档中「提供者」部分的 \"2、YML配置\"",
    "hint": "请留意文档中提供者YML配置里 `port: -1` 旁边的注释文字。"
  },
  {
    "question": "在Dubbo服务消费者（Consumer）的代码中，`@Reference` 注解的主要作用是什么？",
    "options": [
      "将一个本地Java类声明并暴露为一个Dubbo服务。",
      "引用一个本地配置文件，用于加载服务的IP地址。",
      "从Dubbo容器中注入一个远程服务的代理对象，实现透明的RPC调用。",
      "标记一个方法，使其调用结果能够被缓存。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "`@Reference` 是Dubbo在消费者端的核心注解。它的作用是告诉Dubbo框架，需要为标记的接口（如IUserService）创建一个远程服务的代理实例。开发者可以直接调用这个代理对象的方法，Dubbo底层会自动处理网络通信、序列化等复杂工作，实现像调用本地方法一样调用远程服务。",
    "source": "文档中「调用者」部分的 \"3、远程调用\" 代码示例",
    "hint": "观察 `UserController` 中，`IUserService` 字段是如何被注入和使用的。"
  },
  {
    "question": "根据文档中的“Dubbo流程图”，当消费者（Consumer）成功从注册中心（Registry）获取到提供者（Provider）的地址后，后续的服务调用是如何进行的？",
    "options": [
      "消费者直接与提供者建立长连接进行通信，不再经过注册中心。",
      "所有的调用请求都必须先发送到注册中心，由注册中心进行路由和转发。",
      "消费者将调用请求发送给监控中心（Monitor），再由监控中心转发给提供者。",
      "注册中心会拦截每次调用，以实现负载均衡策略。"
    ],
    "correctAnswerIndex": 0,
    "explanation": "Dubbo流程图清晰地表明，注册中心的核心角色是“服务注册”与“服务发现”。一旦消费者获取到提供者地址列表，它就会缓存这些信息，并直接与目标提供者建立连接进行RPC调用。后续的通信不再依赖注册中心，这大大降低了注册中心的压力，提升了调用效率。",
    "source": "文档中「Dubbo流程图」部分",
    "hint": "在流程图中，仔细观察服务调用（Invoke）的箭头是从哪里指向哪里的。"
  },
  {
    "question": "在Dubbo的整体架构中，哪个组件的核心职责是收集服务调用的次数、耗时等统计数据，用于服务治理和监控？",
    "options": [
      "服务容器 (Container)",
      "注册中心 (Registry)",
      "监控中心 (Monitor)",
      "服务提供者 (Provider)"
    ],
    "correctAnswerIndex": 2,
    "explanation": "根据“Dubbo流程图”，消费者和提供者在每次调用完成后，都会异步地将调用信息（如方法名、调用耗时、成功与否）上报给监控中心（Monitor）。监控中心负责对这些数据进行聚合、存储和展示，为运维人员提供了服务状态的可视化界面。",
    "source": "文档中「Dubbo流程图」部分",
    "hint": "在流程图中，哪个组件同时接收来自Consumer和Provider的上报信息？"
  },
  {
    "question": "要在服务提供者的实现类（如 `UserServiceImpl`）上将其暴露为可供远程调用的Dubbo服务，应该使用以下哪个注解？",
    "options": [
      "@RestController",
      "@Reference",
      "@Service (com.alibaba.dubbo.config.annotation.Service)",
      "@Component"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档的 `UserServiceImpl` 代码示例中，类定义上方使用了 `@Service` 注解。注意，这个注解是 `com.alibaba.dubbo.config.annotation.Service`，专属于Dubbo框架，用于将该Java Bean暴露为Dubbo服务。它区别于Spring框架的 `@Service` 注解。",
    "source": "文档中「提供者」部分的 \"接口实现类\" 代码示例",
    "hint": "查看提供者 `UserServiceImpl.java` 文件的源代码，注意类声明顶部的注解是什么。"
  },
  {
    "question": "在服务消费者的YML配置文件中，`dubbo.consumer.check = false` 这个配置项的作用是什么？",
    "options": [
      "禁用消费者对远程服务提供者的健康检查。",
      "在应用启动时，即使依赖的远程服务提供者尚未启动，消费者也不会报错。",
      "禁用消费者的本地缓存，每次调用都强制请求远程服务。",
      "关闭消费者的日志输出功能。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档中对 `dubbo.consumer.check` 的注释是“禁用所有服务的启动检查”。默认情况下，Dubbo消费者在启动时会检查其依赖的远程服务是否可用，如果不可用则会抛出异常导致启动失败。将此项设为`false`可以关闭这个检查，允许消费者在提供者未就绪的情况下先行启动，这在复杂的分布式系统启动顺序管理中非常有用。",
    "source": "文档中「调用者」部分的 \"2、YML配置\"",
    "hint": "阅读消费者YML配置中 `consumer` 节点下的 `check` 属性及其注释。"
  },
  {
    "question": "综合整个文档，一个完整的Dubbo RPC调用流程中，服务地址的发现机制是怎样的？",
    "options": [
      "消费者通过HTTP轮询的方式，定期向提供者询问其地址。",
      "地址信息被硬编码在消费者的代码或配置文件中。",
      "提供者启动后将服务地址注册到注册中心，消费者启动时向注册中心订阅服务，从而获取地址。",
      "消费者通过广播消息到局域网，提供者收到后响应自己的地址。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "这是Dubbo服务发现的核心机制。流程图展示了：1. Provider向Registry注册服务；2. Consumer向Registry订阅服务。这种基于“注册-订阅”的模式，使得服务提供方和消费方完全解耦，提供者可以动态上线或下线，而消费者能够自动感知这些变化，是实现服务动态扩展和高可用的关键。",
    "source": "文档中「Dubbo流程图」部分",
    "hint": "思考注册中心（Registry）在提供者和消费者之间扮演的“中间人”角色。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
        // 存储每个问题的回答状态
        const userAnswers = new Array(quizData.length).fill(null); 

        const questionTextEl = document.getElementById('question-text');
        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

        function loadQuestion() {
          resultContainerEl.innerHTML = '';
          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
          if (currentQuestionIndex >= quizData.length) {
            showFinalScore();
            return;
          }

          updateProgress();

          const currentQuestion = quizData[currentQuestionIndex];
          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
          currentQuestion.options.forEach((optionText, index) => {
            const li = document.createElement('li');
            li.className = 'option-item';
            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
                if (index === userAnswers[currentQuestionIndex]) {
                    li.classList.add('selected');
                }
            }
            optionsListEl.appendChild(li);
          });

          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
              const isCorrect = userAnswers[currentQuestionIndex] === currentQuestion.correctAnswerIndex;
              showResult(isCorrect, currentQuestion);
          }
          
          updateNavigationButtons();
          updateProgress();
        }

        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

            showResult(isCorrect, currentQuestion);
            updateNavigationButtons();
        }
        
        function updateProgress() {
            const answeredQuestions = userAnswers.filter(answer => answer !== null).length;
            const progressPercentage = (answeredQuestions / quizData.length) * 100;
            progressIndicatorEl.style.width = `${progressPercentage}%`;
        }
        
        function updateNavigationButtons() {
            prevBtn.style.display = 'block';
            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
            Array.from(optionsListEl.children).forEach((child, index) => {
                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
            });
        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
        }

        function goToPreviousQuestion() {
            if (currentQuestionIndex > 0) {
                currentQuestionIndex--;
                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
            if (currentQuestion.hint) {
                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  